That said, both are complicated as compared to todays
“Push the button”.
"Push the button" suggests someone who only knows how to use Direct-to. I find that many pilots don't have a workable understanding of how to do many things using a GPS navigator. Pilots who have only been trained to use conventional navigation systems will often struggle with:
1. What Activate an approach means
2. How to join an approach at IF that is not listed in the approach dialog
3. How to control a hold, more turns, no more turns in an approach
4. How to use OBS mode
5. How to activate a leg
6. How to enter a flight plan route
7. How to edit a flight plan route
8. How to fly a course to a fix
9. How to initiate the missed approach
10. How to fly an ILS using an integrated GPS/ILS/VOR navigator
11. How to fly an LPV
12. What is required to fly an LP
13. How to determine if an LPV to LNAV downgrade is likely
14. Meaning of the chart note "Visual Segment - Obstacles"
15. Meaning of +V annunciation
16. How to do a hold that is not in an approach procedure
17. Meaning of vectors to final when there is a course change at the FAF
18. Meaning of "Fly visual to airport"
Plus many many more things not in this list.